Here are a few previous threads on mirrors, with lots of good information and recommendations:

http://forums.teamestrogen.com/showt...=helmet+mirror

http://forums.teamestrogen.com/showt...=helmet+mirror

http://forums.teamestrogen.com/showt...=helmet+mirror

http://forums.teamestrogen.com/showt...=helmet+mirror

http://forums.teamestrogen.com/showt...=helmet+mirror

http://forums.teamestrogen.com/showt...=helmet+mirror